Phonons in slow motion: Dispersion relations in ultrathin Si membranes

J. Cuffe, E. Chavez, Andrey Shchepetov, P.-O. Chapuis, E.H. El Boudouti, F. Alzina, T. Kehoe, J. Gomis-Bresco, D. Dudek, Y. Pennec, B. Djafari-Rouhani, Mika Prunnila, Jouni Ahopelto, C.M. Sotomayor Torres (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    66 Citations (Scopus)

    Abstract

    We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.
    Original languageEnglish
    Pages (from-to)3569-3573
    Number of pages4
    JournalNano Letters
    Volume12
    Issue number7
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

      Fingerprint

    Keywords

    • Confined phonons
    • dispersion relations
    • inelastic light scattering
    • Si membranes
    • slow phonons
    • ultrathin

    Cite this

    Cuffe, J., Chavez, E., Shchepetov, A., Chapuis, P-O., El Boudouti, E. H., Alzina, F., Kehoe, T., Gomis-Bresco, J., Dudek, D., Pennec, Y., Djafari-Rouhani, B., Prunnila, M., Ahopelto, J., & Sotomayor Torres, C. M. (2012). Phonons in slow motion: Dispersion relations in ultrathin Si membranes. Nano Letters, 12(7), 3569-3573. https://doi.org/10.1021/nl301204u